dict1 = {'number': 120191080323, 'name': 'xulihao', 'class': 1901, 'age': 19}
dict1['school'] = "ncepu"
dict1['age'] = 20
del dict1['class']
print(dict1['number'])
print(dict1['name'])
print(dict1['age'])
print(dict1['school'])

